Levered tool with cooperating jaws

Abstract

A levered tool includes two cooperating jaws, two cover plates pivotably mounting therebetween the jaws, two handles providing a levering function for the jaws, and two pivotally connected toggles each of which includes a first end pivotally connected to one of the jaws and a second end fixed to one of the handles, wherein the tool is further provided with an adjusting device connected between the toggles and capable of adjusting the distance between the first ends of the toggles.

What I claim is: 
     
       1. A levered tool with cooperating jaws comprising two cooperating jaws adapted to clamp or shear therebetween an object, two cover plates pivotably mounting therebetween said two jaws in a manner that said two jaws are capable of working said object, two handles capable of providing a levering function for said two jaws, and two toggles pivotally connected together and each of which includes a first end pivotally connected to one of said jaws and a second end fixed to one of said handles, wherein the improvement resides in that said tool further includes: a first adjusting means mounted and connected between said two toggles, capable of adjusting a distance between said first ends of said toggles, providing the pivotal connection between said toggles, and including:   a first rod member having a first end pivotably connected to one of said toggles and a second threaded end; and   a first adjusting member rotatably received in the other said toggle and having a through threaded hole threadedly engaging therein said second threaded end; and   a second adjusting means connected between said first adjusting means and said one toggle so that said distance can be adjusted in a greater extent, and including:   a second rod member having a third end pivotably connected to said first rod member including a sliding means capable of axially sliding in but incapable of rotating with respect to said one toggle, and a first threaded portion; and   a second adjusting member rotatably received in said one toggle and having a second through threaded hole threadedly engaging therein said first threaded portion.   
     
     
       2. A levered tool with cooperating jaws according to claim 1 wherein: said sliding means includes a square portion having a diagonal length shorter than a diameter of said first threaded portion, and said second rod member further includes a second threaded portion having a diameter shorter than said diagonal length;   said one toggle includes a third through hole slidably and non-rotatably receiving therein said second rod member;   said third through hole includes a cylindrical room receiving therein said first threaded portion and a squared room capable of receiving therein said squared portion;   said second adjusting member further includes a second adjusting flange matching against an inner side surface, with respect to said tool, of said one toggle;   said second threaded portion protrudes beyond said third through hole; and   said tool further includes a second nut threadedly engaging therein said protruded second threaded portion for urging said inner side surface of said one toggle against said second adjusting flange from an opposite outer side surface of said one toggle.   
     
     
       3. A levered tool with cooperating jaws comprising two cooperating jaws adapted to clamp or shear an object therebetween, two cover plates pivotably mounting therebetween said two jaws in a manner that said two jaws are capable of working said object, two handles capable of providing a levering function for said two jaws, and two toggles pivotally connected together and each of which includes a first end pivotally connected to one of said jaws and a second end fixed to one of said handles, wherein the improvement resides in that said tool further includes an adjusting means which is mounted and connected between said two toggles and capable of adjusting a distance between said first ends of said toggles, provides the pivotal connection between said toggles, and includes: a rod member having a first threaded portion and a third end pivotally connected to one of said toggles, and a means capable of axially sliding in but incapable of rotating with respect to the other said toggle; and   an adjusting member rotatably received in said the other toggle and having a threaded through hole threadedly engaging therein said first threaded portion.